/* GTK - The GIMP Toolkit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

#include <glib/gprintf.h>
#include <math.h>
#include <string.h>
#include "gtkprogress.h" 
#include "gtkintl.h"

#define EPSILON  1e-5
#define DEFAULT_FORMAT "%P %%"

enum {
  PROP_0,
  PROP_ACTIVITY_MODE,
  PROP_SHOW_TEXT,
  PROP_TEXT_XALIGN,
  PROP_TEXT_YALIGN
};


static void gtk_progress_class_init      (GtkProgressClass *klass);
static void gtk_progress_init            (GtkProgress      *progress);
static void gtk_progress_set_property    (GObject          *object,
					  guint             prop_id,
					  const GValue     *value,
					  GParamSpec       *pspec);
static void gtk_progress_get_property    (GObject          *object,
					  guint             prop_id,
					  GValue           *value,
					  GParamSpec       *pspec);
static void gtk_progress_destroy         (GtkObject        *object);
static void gtk_progress_finalize        (GObject          *object);
static void gtk_progress_realize         (GtkWidget        *widget);
static gint gtk_progress_expose          (GtkWidget        *widget,
				 	  GdkEventExpose   *event);
static void gtk_progress_size_allocate   (GtkWidget        *widget,
				 	  GtkAllocation    *allocation);
static void gtk_progress_create_pixmap   (GtkProgress      *progress);
static void gtk_progress_value_changed   (GtkAdjustment    *adjustment,
					  GtkProgress      *progress);
static void gtk_progress_changed         (GtkAdjustment    *adjustment,
					  GtkProgress      *progress);


static GtkWidgetClass *parent_class = NULL;


GType
gtk_progress_get_type (void)
{
  static GType progress_type = 0;

  if (!progress_type)
    {
      static const GTypeInfo progress_info =
      {
	sizeof (GtkProgressClass),
	NULL,		/* base_init */
	NULL,		/* base_finalize */
	(GClassInitFunc) gtk_progress_class_init,
	NULL,		/* class_finalize */
	NULL,		/* class_data */
	sizeof (GtkProgress),
	0,		/* n_preallocs */
	(GInstanceInitFunc) gtk_progress_init,
      };

      progress_type = g_type_register_static (GTK_TYPE_WIDGET, "GtkProgress",
					      &progress_info, 0);
    }

  return progress_type;
}

static void
gtk_progress_class_init (GtkProgressClass *class)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (class);
  GtkObjectClass *object_class;
  GtkWidgetClass *widget_class;

  object_class = (GtkObjectClass *) class;
  widget_class = (GtkWidgetClass *) class;

  parent_class = gtk_type_class (GTK_TYPE_WIDGET);

  gobject_class->finalize = gtk_progress_finalize;

  gobject_class->set_property = gtk_progress_set_property;
  gobject_class->get_property = gtk_progress_get_property;
  object_class->destroy = gtk_progress_destroy;

  widget_class->realize = gtk_progress_realize;
  widget_class->expose_event = gtk_progress_expose;
  widget_class->size_allocate = gtk_progress_size_allocate;

  /* to be overridden */
  class->paint = NULL;
  class->update = NULL;
  class->act_mode_enter = NULL;

  g_object_class_install_property (gobject_class,
                                   PROP_ACTIVITY_MODE,
                                   g_param_spec_boolean ("activity-mode",
							 _("Activity mode"),
							 _("If TRUE the GtkProgress is in activity mode, meaning that it signals something is happening, but not how much of the activity is finished. This is used when you're doing something that you don't know how long it will take"),
							 FALSE,
							 G_PARAM_READWRITE));

  g_object_class_install_property (gobject_class,
                                   PROP_SHOW_TEXT,
                                   g_param_spec_boolean ("show-text",
							 _("Show text"),
							 _("Whether the progress is shown as text"),
							 FALSE,
							 G_PARAM_READWRITE));

  g_object_class_install_property (gobject_class,
				   PROP_TEXT_XALIGN,
				   g_param_spec_float ("text-xalign",
						       _("Text x alignment"),
						       _("A number between 0.0 and 1.0 specifying the horizontal alignment of the text in the progress widget"),
						       0.0,
						       1.0,
						       0.5,
						       G_PARAM_READWRITE));  
    g_object_class_install_property (gobject_class,
				   PROP_TEXT_YALIGN,
				   g_param_spec_float ("text-yalign",
						       _("Text y alignment"),
						       _("A number between 0.0 and 1.0 specifying the vertical alignment of the text in the progress widget"),
						       0.0,
						       1.0,
						       0.5,
						       G_PARAM_READWRITE));
}

static void
gtk_progress_set_property (GObject      *object,
			   guint         prop_id,
			   const GValue *value,
			   GParamSpec   *pspec)
{
  GtkProgress *progress;
  
  progress = GTK_PROGRESS (object);

  switch (prop_id)
    {
    case PROP_ACTIVITY_MODE:
      gtk_progress_set_activity_mode (progress, g_value_get_boolean (value));
      break;
    case PROP_SHOW_TEXT:
      gtk_progress_set_show_text (progress, g_value_get_boolean (value));
      break;
    case PROP_TEXT_XALIGN:
      gtk_progress_set_text_alignment (progress,
				       g_value_get_float (value),
				       progress->y_align);
      break;
    case PROP_TEXT_YALIGN:
      gtk_progress_set_text_alignment (progress,
				       progress->x_align,
				       g_value_get_float (value));
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
gtk_progress_get_property (GObject      *object,
			   guint         prop_id,
			   GValue       *value,
			   GParamSpec   *pspec)
{
  GtkProgress *progress;
  
  progress = GTK_PROGRESS (object);

  switch (prop_id)
    {
    case PROP_ACTIVITY_MODE:
      g_value_set_boolean (value, (progress->activity_mode != FALSE));
      break;
    case PROP_SHOW_TEXT:
      g_value_set_boolean (value, (progress->show_text != FALSE));
      break;
    case PROP_TEXT_XALIGN:
      g_value_set_float (value, progress->x_align);
      break;
    case PROP_TEXT_YALIGN:
      g_value_set_float (value, progress->y_align);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
gtk_progress_init (GtkProgress *progress)
{
  progress->adjustment = NULL;
  progress->offscreen_pixmap = NULL;
  progress->format = g_strdup (DEFAULT_FORMAT);
  progress->x_align = 0.5;
  progress->y_align = 0.5;
  progress->show_text = FALSE;
  progress->activity_mode = FALSE;
  progress->use_text_format = TRUE;
}

static void
gtk_progress_realize (GtkWidget *widget)
{
  GtkProgress *progress;
  GdkWindowAttr attributes;
  gint attributes_mask;

  g_return_if_fail (GTK_IS_PROGRESS (widget));

  progress = GTK_PROGRESS (widget);
  GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);

  attributes.window_type = GDK_WINDOW_CHILD;
  attributes.x = widget->allocation.x;
  attributes.y = widget->allocation.y;
  attributes.width = widget->allocation.width;
  attributes.height = widget->allocation.height;
  attributes.wclass = GDK_INPUT_OUTPUT;
  attributes.visual = gtk_widget_get_visual (widget);
  attributes.colormap = gtk_widget_get_colormap (widget);
  attributes.event_mask = gtk_widget_get_events (widget);
  attributes.event_mask |= GDK_EXPOSURE_MASK;

  attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;

  widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
				   &attributes, attributes_mask);
  gdk_window_set_user_data (widget->window, progress);

  widget->style = gtk_style_attach (widget->style, widget->window);
  gtk_style_set_background (widget->style, widget->window, GTK_STATE_ACTIVE);

  gtk_progress_create_pixmap (progress);
}

static void
gtk_progress_destroy (GtkObject *object)
{
  GtkProgress *progress;

  g_return_if_fail (GTK_IS_PROGRESS (object));

  progress = GTK_PROGRESS (object);

  if (progress->adjustment)
    {
      g_signal_handlers_disconnect_by_func (progress->adjustment,
					    gtk_progress_value_changed,
					    progress);
      g_signal_handlers_disconnect_by_func (progress->adjustment,
					    gtk_progress_changed,
					    progress);
      g_object_unref (progress->adjustment);
      progress->adjustment = NULL;
    }

  GTK_OBJECT_CLASS (parent_class)->destroy (object);
}

static void
gtk_progress_finalize (GObject *object)
{
  GtkProgress *progress;

  g_return_if_fail (GTK_IS_PROGRESS (object));

  progress = GTK_PROGRESS (object);

  if (progress->offscreen_pixmap)
    g_object_unref (progress->offscreen_pixmap);

  if (progress->format)
    g_free (progress->format);

  G_OBJECT_CLASS (parent_class)->finalize (object);
}

static gint
gtk_progress_expose (GtkWidget      *widget,
		     GdkEventExpose *event)
{
  g_return_val_if_fail (GTK_IS_PROGRESS (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  if (GTK_WIDGET_DRAWABLE (widget))
    gdk_draw_drawable (widget->window,
		       widget->style->black_gc,
		       GTK_PROGRESS (widget)->offscreen_pixmap,
		       event->area.x, event->area.y,
		       event->area.x, event->area.y,
		       event->area.width,
		       event->area.height);

  return FALSE;
}

static void
gtk_progress_size_allocate (GtkWidget     *widget,
			    GtkAllocation *allocation)
{
  g_return_if_fail (GTK_IS_PROGRESS (widget));
  g_return_if_fail (allocation != NULL);

  widget->allocation = *allocation;

  if (GTK_WIDGET_REALIZED (widget))
    {
      gdk_window_move_resize (widget->window,
			      allocation->x, allocation->y,
			      allocation->width, allocation->height);

      gtk_progress_create_pixmap (GTK_PROGRESS (widget));
    }
}

static void
gtk_progress_create_pixmap (GtkProgress *progress)
{
  GtkWidget *widget;

  g_return_if_fail (GTK_IS_PROGRESS (progress));

  if (GTK_WIDGET_REALIZED (progress))
    {
      widget = GTK_WIDGET (progress);

      if (progress->offscreen_pixmap)
	g_object_unref (progress->offscreen_pixmap);

      progress->offscreen_pixmap = gdk_pixmap_new (widget->window,
						   widget->allocation.width,
						   widget->allocation.height,
						   -1);
      GTK_PROGRESS_GET_CLASS (progress)->paint (progress);
    }
}

static void
gtk_progress_changed (GtkAdjustment *adjustment,
		      GtkProgress   *progress)
{
  /* A change in the value of adjustment->upper can change
   * the size request
   */
  if (progress->use_text_format && progress->show_text)
    gtk_widget_queue_resize (GTK_WIDGET (progress));
  else
    GTK_PROGRESS_GET_CLASS (progress)->update (progress);
}

static void
gtk_progress_value_changed (GtkAdjustment *adjustment,
			    GtkProgress   *progress)
{
  GTK_PROGRESS_GET_CLASS (progress)->update (progress);
}

static gchar *
gtk_progress_build_string (GtkProgress *progress,
			   gdouble      value,
			   gdouble      percentage)
{
  gchar buf[256] = { 0 };
  gchar tmp[256] = { 0 };
  gchar *src;
  gchar *dest;
  gchar fmt[10];

  src = progress->format;

  /* This is the new supported version of this function */
  if (!progress->use_text_format)
    return g_strdup (src);

  /* And here's all the deprecated goo. */
  
  dest = buf;
 
  while (src && *src)
    {
      if (*src != '%')
	{
	  *dest = *src;
	  dest++;
	}
      else
	{
	  gchar c;
	  gint digits;

	  c = *(src + sizeof(gchar));
	  digits = 0;

	  if (c >= '0' && c <= '2')
	    {
	      digits = (gint) (c - '0');
	      src++;
	      c = *(src + sizeof(gchar));
	    }

	  switch (c)
	    {
	    case '%':
	      *dest = '%';
	      src++;
	      dest++;
	      break;
	    case 'p':
	    case 'P':
	      if (digits)
		{
		  g_snprintf (fmt, sizeof (fmt), "%%.%df", digits);
		  g_snprintf (tmp, sizeof (tmp), fmt, 100 * percentage);
		}
	      else
		g_snprintf (tmp, sizeof (tmp), "%.0f", 100 * percentage);
	      strcat (buf, tmp);
	      dest = &(buf[strlen (buf)]);
	      src++;
	      break;
	    case 'v':
	    case 'V':
	      if (digits)
		{
		  g_snprintf (fmt, sizeof (fmt), "%%.%df", digits);
		  g_snprintf (tmp, sizeof (tmp), fmt, value);
		}
	      else
		g_snprintf (tmp, sizeof (tmp), "%.0f", value);
	      strcat (buf, tmp);
	      dest = &(buf[strlen (buf)]);
	      src++;
	      break;
	    case 'l':
	    case 'L':
	      if (digits)
		{
		  g_snprintf (fmt, sizeof (fmt), "%%.%df", digits);
		  g_snprintf (tmp, sizeof (tmp), fmt, progress->adjustment->lower);
		}
	      else
		g_snprintf (tmp, sizeof (tmp), "%.0f", progress->adjustment->lower);
	      strcat (buf, tmp);
	      dest = &(buf[strlen (buf)]);
	      src++;
	      break;
	    case 'u':
	    case 'U':
	      if (digits)
		{
		  g_snprintf (fmt, sizeof (fmt), "%%.%df", digits);
		  g_snprintf (tmp, sizeof (tmp), fmt, progress->adjustment->upper);
		}
	      else
		g_snprintf (tmp, sizeof (tmp), "%.0f", progress->adjustment->upper);
	      strcat (buf, tmp);
	      dest = &(buf[strlen (buf)]);
	      src++;
	      break;
	    default:
	      break;
	    }
	}
      src++;
    }

  return g_strdup (buf);
}

/***************************************************************/

void
gtk_progress_set_adjustment (GtkProgress   *progress,
			     GtkAdjustment *adjustment)
{
  g_return_if_fail (GTK_IS_PROGRESS (progress));
  if (adjustment)
    g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
  else
    adjustment = (GtkAdjustment*) gtk_adjustment_new (0, 0, 100, 0, 0, 0);

  if (progress->adjustment != adjustment)
    {
      if (progress->adjustment)
        {
	  g_signal_handlers_disconnect_by_func (progress->adjustment,
						gtk_progress_changed,
						progress);
	  g_signal_handlers_disconnect_by_func (progress->adjustment,
						gtk_progress_value_changed,
						progress);
          g_object_unref (progress->adjustment);
        }
      progress->adjustment = adjustment;
      if (adjustment)
        {
          g_object_ref (adjustment);
	  gtk_object_sink (GTK_OBJECT (adjustment));
          g_signal_connect (adjustment, "changed",
			    G_CALLBACK (gtk_progress_changed),
			    progress);
          g_signal_connect (adjustment, "value_changed",
			    G_CALLBACK (gtk_progress_value_changed),
			    progress);
        }

      gtk_progress_changed (adjustment, progress);
    }
}

void
gtk_progress_configure (GtkProgress *progress,
			gdouble      value,
			gdouble      min,
			gdouble      max)
{
  GtkAdjustment *adj;
  gboolean changed = FALSE;

  g_return_if_fail (GTK_IS_PROGRESS (progress));
  g_return_if_fail (min <= max);
  g_return_if_fail (value >= min && value <= max);

  if (!progress->adjustment)
    gtk_progress_set_adjustment (progress, NULL);
  adj = progress->adjustment;

  if (fabs (adj->lower - min) > EPSILON || fabs (adj->upper - max) > EPSILON)
    changed = TRUE;

  adj->value = value;
  adj->lower = min;
  adj->upper = max;

  gtk_adjustment_value_changed (adj);
  if (changed)
    gtk_adjustment_changed (adj);
}

void
gtk_progress_set_percentage (GtkProgress *progress,
			     gdouble      percentage)
{
  g_return_if_fail (GTK_IS_PROGRESS (progress));
  g_return_if_fail (percentage >= 0 && percentage <= 1.0);

  if (!progress->adjustment)
    gtk_progress_set_adjustment (progress, NULL);
  gtk_progress_set_value (progress, progress->adjustment->lower + percentage * 
		 (progress->adjustment->upper - progress->adjustment->lower));
}

gdouble
gtk_progress_get_current_percentage (GtkProgress *progress)
{
  g_return_val_if_fail (GTK_IS_PROGRESS (progress), 0);

  if (!progress->adjustment)
    gtk_progress_set_adjustment (progress, NULL);

  return gtk_progress_get_percentage_from_value (progress, progress->adjustment->value);
}

gdouble
gtk_progress_get_percentage_from_value (GtkProgress *progress,
					gdouble      value)
{
  g_return_val_if_fail (GTK_IS_PROGRESS (progress), 0);

  if (!progress->adjustment)
    gtk_progress_set_adjustment (progress, NULL);

  if (progress->adjustment->lower < progress->adjustment->upper &&
      value >= progress->adjustment->lower &&
      value <= progress->adjustment->upper)
    return (value - progress->adjustment->lower) /
      (progress->adjustment->upper - progress->adjustment->lower);
  else
    return 0.0;
}

void
gtk_progress_set_value (GtkProgress *progress,
			gdouble      value)
{
  g_return_if_fail (GTK_IS_PROGRESS (progress));

  if (!progress->adjustment)
    gtk_progress_set_adjustment (progress, NULL);

  if (fabs (progress->adjustment->value - value) > EPSILON)
    gtk_adjustment_set_value (progress->adjustment, value);
}

gdouble
gtk_progress_get_value (GtkProgress *progress)
{
  g_return_val_if_fail (GTK_IS_PROGRESS (progress), 0);

  return progress->adjustment ? progress->adjustment->value : 0;
}

void
gtk_progress_set_show_text (GtkProgress *progress,
			    gboolean     show_text)
{
  g_return_if_fail (GTK_IS_PROGRESS (progress));

  if (progress->show_text != show_text)
    {
      progress->show_text = show_text;

      gtk_widget_queue_resize (GTK_WIDGET (progress));

      g_object_notify (G_OBJECT (progress), "show-text");
    }
}

void
gtk_progress_set_text_alignment (GtkProgress *progress,
				 gfloat       x_align,
				 gfloat       y_align)
{
  g_return_if_fail (GTK_IS_PROGRESS (progress));
  g_return_if_fail (x_align >= 0.0 && x_align <= 1.0);
  g_return_if_fail (y_align >= 0.0 && y_align <= 1.0);

  if (progress->x_align != x_align || progress->y_align != y_align)
    {
      g_object_freeze_notify (G_OBJECT (progress));
      if (progress->x_align != x_align)
	{
	  progress->x_align = x_align;
	  g_object_notify (G_OBJECT (progress), "text-xalign");
	}

      if (progress->y_align != y_align)
	{
	  progress->y_align = y_align;
	  g_object_notify (G_OBJECT (progress), "text-yalign");
	}
      g_object_thaw_notify (G_OBJECT (progress));

      if (GTK_WIDGET_DRAWABLE (GTK_WIDGET (progress)))
	gtk_widget_queue_resize (GTK_WIDGET (progress));
    }
}

void
gtk_progress_set_format_string (GtkProgress *progress,
				const gchar *format)
{
  gchar *old_format;
  
  g_return_if_fail (GTK_IS_PROGRESS (progress));

  /* Turn on format, in case someone called
   * gtk_progress_bar_set_text() and turned it off.
   */
  progress->use_text_format = TRUE;

  old_format = progress->format;

  if (!format)
    format = DEFAULT_FORMAT;

  progress->format = g_strdup (format);
  g_free (old_format);
  
  gtk_widget_queue_resize (GTK_WIDGET (progress));
}

gchar *
gtk_progress_get_current_text (GtkProgress *progress)
{
  g_return_val_if_fail (GTK_IS_PROGRESS (progress), 0);

  if (!progress->adjustment)
    gtk_progress_set_adjustment (progress, NULL);

  return gtk_progress_build_string (progress, progress->adjustment->value,
				    gtk_progress_get_current_percentage (progress));
}

gchar *
gtk_progress_get_text_from_value (GtkProgress *progress,
				  gdouble      value)
{
  g_return_val_if_fail (GTK_IS_PROGRESS (progress), 0);

  if (!progress->adjustment)
    gtk_progress_set_adjustment (progress, NULL);

  return gtk_progress_build_string (progress, value,
				    gtk_progress_get_percentage_from_value (progress, value));
}

void
gtk_progress_set_activity_mode (GtkProgress *progress,
				gboolean     activity_mode)
{
  g_return_if_fail (GTK_IS_PROGRESS (progress));

  if (progress->activity_mode != (activity_mode != FALSE))
    {
      progress->activity_mode = (activity_mode != FALSE);

      if (progress->activity_mode)
	GTK_PROGRESS_GET_CLASS (progress)->act_mode_enter (progress);

      if (GTK_WIDGET_DRAWABLE (GTK_WIDGET (progress)))
	gtk_widget_queue_resize (GTK_WIDGET (progress));

      g_object_notify (G_OBJECT (progress), "activity-mode");
    }
}
